Round off a floating point number to nearest integer

Given a floating point number , convert it nearest integer. 

Approach
Check if floating number is positive, add 0.5 to it otherwise subtract 0.5. For Example if input is -6.8 output will be  -7 , if input is 7.5 output will be 8
Input:       A floating point number.

Output:    Nearest integer

#include <iostream>

using namespace std;
int round_float ( float r )
{
    return ( r > 0.0 ) ? ( r + 0.5 ) : ( r - 0.5 );
}
int main()
{
    float f;
    cin>>f;
    cout<<round_float ( f );
    getchar();

}

Please comment if you find anything incorrect or have any other inputs